Selecting any live TV channel results in the msg, "searching for a signal on this channel". Happens on all channels ... HD, SD, Digital ... For a few days before this, I was having pixelation problems on about 1/3 of my channels. Then they were all gone. Recorded programs and streaming shows play fine, just not live stations. Recording since the signal disappeared also play as a black screen. I uncovered the unit and jiggles things ... but nothing helped. If anyone has experienced this issue and found a way around it, I sure appreciate your guidance on what to do? Of course, this sounds like a tuner issue, which must be on the motherboard. If I recall correctly, swapping the motherboard will terminate my lifetime service on the unit. That's a bummer. Guess I'll investigate having the board fixed. Again, has anyone had this kind of repair. If so, giving me some approximation of the cost would sure help making the decision.